Cal. Sts. & High. Code § 30308

Money required to meet the costs of acquisition or construction and all expenses and costs incidental to the acquisition or construction of any particular toll bridge or other highway crossing, transportation facilities, or additional transportation facilities, or to meet the costs of operating, maintaining, and repairing them, shall be paid from the proper fund therefor upon demand of the department and after audit thereof as provided by law upon warrants drawn by the Controller.